CVE-2026-20073
A vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthentica…
Published Mar 4, 2026 · updated Aug 11, 2026 · cisco adaptive security appliance software
A vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to send traffic that should be denied through an affected device. This vulnerability is due to improper error handling when an affected device that is joining a cluster runs out of memory while replicating access control rules. An attacker could exploit this vulnerability by sending traffic that should be blocked through the device. A successful exploit could allow the attacker to bypass access controls and reach devices in protected networks.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Mar 4, 2026 · NIST NVD
Detected
A vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to send traffic that should be denied through an affected device. This vulnerability is due to improper error handling when an affected device that is joining a cluster runs out of memory while replicating access
Aug 11, 2026 · NIST NVD
Updated
A vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to send traffic that should be denied through an affected device. This vulnerability is due to improper error handling when an affected device that is joining a cluster runs out of memory while replicating access
Affected
- cpe cisco/adaptive security appliance software9.12.1
- cpe cisco/adaptive security appliance software9.12.1.2
- cpe cisco/adaptive security appliance software9.12.1.3
- cpe cisco/adaptive security appliance software9.12.2
- cpe cisco/adaptive security appliance software9.12.2.1
- cpe cisco/adaptive security appliance software9.12.2.4
- cpe cisco/adaptive security appliance software9.12.2.5
- cpe cisco/adaptive security appliance software9.12.2.9
- cpe cisco/secure firewall threat defense6.4.0
Sources
- NIST NVDVulnerability recordCVE-2026-20073
A vulnerability in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to send traffic that should be denied through an affected device. This vulnerability is d
nvd.nist.gov